Nozzle device for shotcrete

Abstract

The invention relates to a sprayer, in particular to a sprayer device for jetting concrete. The sprayer device comprises a water inlet, a valve, a sprayer base and a sprayer. A channel allowing the concrete to pass is arranged in the sprayer base. The sprayer is communicated with the sprayer base. A water ring cavity communicated with the water inlet is formed between the outer wall of the sprayer base and the channel. A water ring sleeve is arranged between the channel and the water ring cavity. Four to eight end faces axially arranged on the water ring sleeve at certain intervals are each provided with four to eight water adding holes communicated with the water ring cavity and the channel. The water adding holes are axially staggered by a certain angle. By means of the sprayer device, dry cement particles which are contained by the concrete and not wetted by moisture can be reduced during jetting, dust is reduced, a rebound material is reduced, and jetting strength is improved.

Description

technical field [0001] The invention relates to a spray head, in particular to a spray head device for spraying concrete. Background technique [0002] With the increase of various pollution and harmful emissions, the control of air pollution has become an important issue in social development, and the concrete spray support process is also one of the sources of air pollution. After decades of development, the concrete shotcrete support technology has been widely used in rock roadway support in building foundation pits, subways, slope protection, expressways, high-speed rail tunnels and mining projects. At present, the concrete support technology has been developed into two methods: dry spraying and wet spraying. The concrete dry spraying process has a long delivery distance, simple equipment, and convenient operation and maintenance. In addition to discharging a large amount of dust around the jetting machine during work, the dry mixture of sand, stones and cement is trans...

AI Technical Summary

Problems solved by technology

At present, the dry spray nozzle system generally adopts the combination of the nozzle seat and the nozzle body, such as figure 1 As shown, a number of small holes are uniformly drilled radially along one end face at one end of the nozzle body, water enters from one end of the nozzle along these small holes and mixes with the dry mixture of sand, stone and cement, and then sprays out. The circumferential end face is mixed with the dry mixture, the mixing time is very short, the mixing space is one surface, the mixing of the water and the dry mixture is very insufficient, resulting in the sprayed concrete containing a large number of dry cement particles that are not wetted by water, forming polluting dust, Seriously endanger the health of workers, and it will also lead to an increase in rebound material during spraying and reduce the strength of the spraying surface

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